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A025028
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Least non-residue mod n is 23.
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0
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10559, 15791, 21118, 31582, 50951, 53231, 53881, 88079, 88919, 92569, 97919, 101902, 102001, 106462, 107762, 123191, 128519, 130729, 138311, 142271, 144169, 158759, 166319, 166609, 167879, 173209, 174599, 176158, 176401, 177838, 185138
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OFFSET
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1,1
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LINKS
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Table of n, a(n) for n=1..31.
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PROG
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(PARI) residue(n, m)=local(r); r=0; for(i=1, floor(m/2), if(i^2%m==n, r=1)); r
isA025028(n)=local(a); a=1; forprime(p=2, 19, a=a && residue(p, n)); a=a && !residue(23, n); a \\ Michael B. Porter, Apr 30 2010
(PARI) is(n)=forprime(p=2, 23, if(!issquare(Mod(p, n)), return(p==23))); 0 \\ Charles R Greathouse IV, Jan 24 2020
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CROSSREFS
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Sequence in context: A065319 A063060 A187727 * A063063 A183600 A302772
Adjacent sequences: A025025 A025026 A025027 * A025029 A025030 A025031
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KEYWORD
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nonn
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AUTHOR
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David W. Wilson
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STATUS
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approved
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